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PWM-based light adjusting circuit

A technology of dimming circuit and PWM signal, which is applied in the layout of electric lamp circuit, light source, electric light source, etc., can solve the difficulty of high precision and small current adjustment, and cannot meet the dimming requirements of high precision and stable color temperature, etc. problem, to achieve the effect of stable color temperature

Inactive Publication Date: 2015-08-19
OPPLE LIGHTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under this dimming method, it is difficult to meet the requirements for high-precision and low-current adjustment;
[0004] Therefore, the existing LED dimming methods have defects and cannot meet the dimming requirements of high precision and stable color temperature.

Method used

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Embodiment Construction

[0035] The advantages of the present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0036] refer to figure 2 , in one embodiment of the present invention, the dimming circuit based on PWM includes a switch element 10, which is connected with the LED light source, and can play the effect of turning on and off; the PWM signal generator is connected with the switch element 10, and sends The element 10 sends a PWM signal. When the PWM signal is high, the switching element 10 is turned on; The signal switching is very fast, visually the strobe of the LED will not be perceived, and the current passing through the switching element 10 is adjusted to a pulse form by the PWM signal generator. In order to achieve the beneficial effects mentioned above, the dimming circuit also includes a constant current power supply, which is connected to the switch element 10 and can output an adjustable output current to the LED ...

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Abstract

The invention provides a PWM-based light adjusting circuit, which comprises a switch element, a PWM signal generator and a constant-current power supply, wherein the switch element is connected with an LED light source; the PWM signal generator is connected with the switch element for adjusting PWM signals to control the switching on and switching off of the switch element; the constant-current power supply is connected with the switch element for outputting an adjustable output current; the constant-current power supply comprises a current reference module, and can adjust the output current to be a reference current Ir; and the current reference module is linked with the PWM signal generator, so that the ration mu of the reference current Ir to a maximum current Imax of the constant-current power supply changes along with the change of the duty ration D of the PWM signals. By adopting the technical scheme, the LED light adjustment can be adjusted at high precision without changing color temperature.

Description

technical field [0001] The invention relates to the field of lighting fixtures, in particular to a dimming circuit based on PWM. Background technique [0002] In the prior art, the dimming of LED lights usually adopts the following methods: [0003] refer to figure 1 , is a PWM dimming method based on a DC / DC converter (such as a BUCK circuit). When the PWM signal sent by the PWM signal generator is high, the driver works and outputs a constant current; when the PWM signal is low, it stops working and uses Adjust the duty cycle of PWM to achieve the purpose of adjusting the output current. However, under this dimming method, it is difficult to meet the requirements for high-precision and low-current adjustment; [0004] Therefore, the existing LED dimming methods have defects, and cannot meet the dimming requirements of high precision and stable color temperature. Contents of the invention [0005] In order to overcome the above-mentioned technical defects, the object ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 陈亮余世伟左壮
Owner OPPLE LIGHTING
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